US11146951B2 - Methods and apparatuses for re-establishing a radio resource control (RRC) connection - Google Patents

Methods and apparatuses for re-establishing a radio resource control (RRC) connection Download PDF

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US11146951B2
US11146951B2 US16/084,165 US201816084165A US11146951B2 US 11146951 B2 US11146951 B2 US 11146951B2 US 201816084165 A US201816084165 A US 201816084165A US 11146951 B2 US11146951 B2 US 11146951B2
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input
mac
ciot
message
authentication token
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US20200337104A1 (en
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Vesa Lehtovirta
Prajwol Kumar Nakarmi
Monica Wifvesson
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Telefonaktiebolaget LM Ericsson AB
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/06—Authentication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/04—Key management, e.g. using generic bootstrapping architecture [GBA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/04—Key management, e.g. using generic bootstrapping architecture [GBA]
    • H04W12/041—Key generation or derivation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/10—Integrity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/18—Management of setup rejection or failure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/25—Maintenance of established connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/08—Mobility data transfer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/02—Data link layer protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/20—Interfaces between hierarchically similar devices between access points
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
    • H04W36/0038—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information of security context information

Definitions

  • Control Plane Cellular Internet of Things (CIoT) optimizations (also called Data Over Non-Access Stratum (NAS) (DoNAS)) is a solution for transporting data over NAS as specified in 3rd Generation Partnership Project (3GPP) technical specification TS 23.401 V14.2.0, clause 5.3.4B (and other specifications, e.g. TS 24.301 V14.2.0).
  • the security features are specified in TS 33.401 V14.1.0, clause 8.2.
  • the security impact of the basic solution is very limited.
  • the purpose of the DoNAS feature is sending data over NAS signalling without establishing data radio bearers (DRBs) and without establishing Access Stratum (AS) security. The intention is to save signalling.
  • FIG. 1 which corresponds to FIG. 5.3.4B.2-1 of TS 23.401 V14.2.0, illustrates the DoNAS principle.
  • the RRC Layer is in the current LTE (Long Term Evolution) systems, see e.g. 3GPP TS 36.331 V14.1.0, specified as including an information element (IE) called ShortMAC-I which is used for identification of the UE, for example, during RRC Connection Reestablishment procedures.
  • IE information element
  • the calculation of the ShortMAC-I includes the following as input:
  • the RRC Layer is in LTE systems specified as including an information element (IE) called ShortResumeMAC-I which is used for identification of the UE, for example, during RRC Connection Resume procedures.
  • IE information element
  • the calculation of the ShortResumeMAC-I includes the following as the input:
  • ShortResumeMAC-I includes additionally a resume constant, which allows differentiation of ShortMAC-I from ResumeShortMAC-I.
  • the used function is specified in TS 33.401 V14.1.0.
  • Another object of the invention is to enable authentication of a target eNB by the UE during RRC connection re-establishment.
  • a method for re-establishing a Radio Resource Control (RRC) connection between a User Equipment (UE) and a target evolved NodeB (target eNB).
  • RRC Radio Resource Control
  • UE User Equipment
  • target eNB target evolved NodeB
  • the RRC Connection Reestablishment message including a downlink (DL) authentication token which has been generated by a Mobility Management to Entity (MME) and has had a Non Access Stratum (NAS) integrity key as input; and
  • DL downlink
  • MME Mobility Management to Entity
  • NAS Non Access Stratum
  • the UE is enabled to authenticate an eNB during RRC connection re-establishment, such as RRC connection re-establishment for EPS CP IoT optimization, with the help of a NAS integrity key.
  • RRC connection re-establishment such as RRC connection re-establishment for EPS CP IoT optimization
  • NAS integrity key no Access Stratum (AS) keys need to be created, which is very beneficial, for example in that NAS keys must be generated anyway, whereas AS keys would have to be generated solely for being used in RRC connection re-establishment.
  • AS Access Stratum
  • the method may also comprise a step of calculating an uplink (UL) authentication token with the NAS integrity key as input, and sending an RRC connection reestablishment request including the UL authentication token to the target eNB.
  • the UL authentication token may in that case be calculated with a target cell's identity as input.
  • the target cell's identity may in the latter case be included in the RRC connection reestablishment request.
  • the DL authentication token may in an embodiment of the method have been calculated by the MME with a target cell's identity as input.
  • the RRC Connection Reestablishment message may include an Input MAC CIoT DL.
  • Authenticating the received DL authentication token may be done by using the Input-MAC CIoT DL and the Non Access Stratum integrity key.
  • the Input-MAC CIoT DL may comprise the target cell's identity.
  • a second aspect relates to a method for re-establishing an RRC connection between a UE and a target eNB and is performed by the target eNB.
  • the method comprises:
  • the method comprises receiving from the UE an RRC connection reestablishment request which includes a UL authentication token, wherein the UL authentication token has been calculated by the UE with the NAS integrity key as input.
  • the UL authentication token may then have been calculated by the UE with a target cell's identity as input.
  • the DL authentication token has been calculated by the MME with a target cell's identity as input.
  • the RRC Connection Reestablishment message includes an Input MAC CIoT DL.
  • the received message may be a Patch Switch Request Acknowledge message and including Input-MAC CIoT DL.
  • the received message may alternatively be a Check MAC Acknowledge message and include Input-MAC CIoT DL.
  • a third aspect relates to a method for re-establishing an RRC connection between a UE and a target eNB and is performed in a source eNB.
  • the method comprises:
  • the received S1 Check response message including the DL authentication token and/or Input-MAC CIoT DL.
  • the response message is in an embodiment of the third aspect an X2 UE in Context response message.
  • a fourth aspect relates to a method for re-establishing an RRC connection between a UE and a target eNB and is performed by an MME.
  • the method comprises:
  • the generation of the DL authentication token is done with a target cell's identity as input (in addition to the NAS integrity key).
  • the method according to the fourth aspect may comprise:
  • the UL authentication token may have been generated by the UE with a target cell's identity as input.
  • the message may be a Path Switch Request Acknowledge message and include Input-MAC CIoT DL.
  • the method may in another embodiment be a Check MAC Acknowledge message and include Input-MAC CIoT DL.
  • a fifth aspect of the invention relates to a UE for re-establishing an RRC connection between the UE and a target eNB.
  • the UE comprises:
  • a processor and a computer program product which stores instructions that, when executed by the processor, causes the UE to:
  • the target eNB receives an RRC Connection Reestablishment message from the target eNB, the RRC Connection Reestablishment message including a DL authentication token which has been generated by an MME and has had a NAS integrity key as input;
  • the RRC Connection Reestablishment message includes Input-MAC CIoT DL, and the received DL authentication token is authenticated by using the Input-MAC CIoT DL and the Non Access Stratum integrity key.
  • the DL authentication token has been calculated by the MME with a target cell's identity as input.
  • a sixth aspect relates to a target eNB for re-establishing an RRC connection between a UE and the target eNB.
  • the target eNB comprises:
  • a computer program product storing instructions that, when executed by the processor, causes the target eNB to:
  • the DL authentication token has in an embodiment of the target eNB been calculated by the MME with a target cell's identity as input.
  • the RRC Connection Reestablishment message includes in an embodiment of the target eNB an Input MAC CIoT DL, i.e. input for the generation of the DL authentication token.
  • the received message is in an embodiment of the target eNB a Patch Switch Request Acknowledge message and includes Input-MAC CIoT DL.
  • the received message is in another embodiment of the target eNB a Check MAC Acknowledge message and includes Input-MAC CIoT DL.
  • a seventh aspect relates to a source eNB for re-establishing an RRC connection between a UE and a target eNB.
  • the source eNB comprises:
  • a computer program product storing instructions that, when executed by the processor, causes the source eNB to:
  • the response message is in an embodiment of the source eNB an X2 UE Context response message.
  • An eighth aspect relates to an MME for re-establishing an RRC connection between a UE and a target eNB.
  • the MME comprises:
  • a computer program product storing instructions that, when executed by the processor, causes the MME to:
  • the message is in an embodiment of the MME a Path Switch Request Acknowledge message and the message is in that embodiment including an Input-MAC CIoT DL.
  • the message is in another embodiment of the MME a Check MAC Acknowledge message.
  • the message includes in that case an Input-MAC CIoT DL.
  • a ninth aspect relates to a UE for re-establishing an RRC connection between the UE and a target eNB.
  • the UE comprises:
  • a communication manager for receiving a RRC Connection Reestablishment message from the target eNB, the RRC Connection Reestablishment message including a DL authentication token which has been generated by an MME and has had a NAS integrity key as input;
  • a tenth aspect relates to a target eNB for re-establishing an RRC connection between a UE and the target eNB.
  • the target eNB comprises:
  • a communication manager for receiving, from an MME, a message including a DL authentication token that has been generated by the MME, wherein the DL authentication token has been generated with a NAS integrity key as input; and for sending an RRC Connection Reestablishment message to the UE, the RRC Connection Reestablishment message including the DL authentication token.
  • An eleventh aspect relates to a source eNB for re-establishing an RRC connection between a UE and a target eNB.
  • the source eNB comprises:
  • a determination manager for obtaining a DL authentication token that has been generated with a NAS integrity key as input
  • a communication manager for sending a response message to the target eNB, the response message including the obtained DL authentication token.
  • a twelfth aspect relates to an MME for re-establishing an RRC connection between a UE and a target eNB.
  • the MME comprises:
  • a communication manager for sending a message including the generated DL authentication token to the target eNB.
  • a thirteenth aspect relates to a computer program for re-establishing an RRC connection between a UE and a target eNB.
  • the computer program comprises computer program code which, when run on the UE, causes the UE to:
  • the target eNB receives an RRC Connection Reestablishment message from the target eNB, the RRC Connection Reestablishment message including a DL authentication token which has been generated by an MME and has had a NAS Stratum integrity key as input;
  • a fourteenth aspect relates to a computer program for re-establishing an RRC connection between a UE and a target eNB.
  • the computer program comprises computer program code which, when run on the target eNB, causes the target eNB to:
  • a fifteenth aspect relates to a computer program for re-establishing an RRC connection between a UE and a target eNB.
  • the computer program comprises computer program code which, when run on a source eNB, causes the source eNB to:
  • a sixteenth aspect relates to a computer program for re-establishing an RRC connection between a UE and a target eNB.
  • the computer program comprises computer program code which, when run on an MME, causes the MME to:
  • a seventeenth aspect relates to a computer program product comprising at least one of the computer programs according to the thirteenth to sixteenth aspects and a computer readable storage means on which the at least one computer program is stored.
  • the re-establishment for RRC connection may be for Control Plane Internet-of-Things optimizations.
  • FIG. 1 schematically shows DoNAS principle signalling
  • FIG. 2 schematically illustrates an environment where embodiments presented herein can be applied
  • FIG. 3 a schematically shows signalling according to a part of an embodiment presented herein;
  • FIG. 3 b schematically shows signalling according to a part of an embodiment presented herein and started in FIG. 3 a;
  • FIG. 4 a schematically shows signalling according to a part of an embodiment presented herein;
  • FIG. 4 b schematically shows signalling according to a part of an embodiment presented herein and started in FIG. 4 a;
  • FIG. 5 schematically shows signalling according to an embodiment presented herein
  • FIG. 6 schematically shows signalling according to an embodiment presented herein
  • FIGS. 7A-7D are flow charts illustrating methods according to embodiments presented herein;
  • FIGS. 8-11 are schematic diagrams illustrating some components of entities presented herein.
  • FIGS. 12-15 are schematic diagrams showing functional modules of embodiments presented herein.
  • Radio Resource Control (RRC) connection re-establishment and RRC connection suspend/resume procedures are existing solutions, which could be candidates for handling a radio link failure in case of a Control Plane (CP) Cellular Internet of Things (CIoT) optimizations case.
  • CP Control Plane
  • CCIoT Cellular Internet of Things
  • Both of those existing solutions use a User Equipment's (UE's) authentication token as described in the background to show to an evolved NodeB (eNB) that a genuine UE 1 wants to re-establish or resume an RRC connection.
  • eNB evolved NodeB
  • integrity protected RRC messages in downlink (DL) direction are used to show to the UE 1 that it is connected to a genuine eNB.
  • AS Access Stratum
  • RRC Radio Resource Control
  • a solution described in the 3GPP contribution S3-161717 proposes that an authentication token would be based on a new RRC integrity key (called KeNB-RRC) which can be derived by both the UE 1 and the Mobility Management Entity (MME) 4 , without setting up AS security (including RRC security) between the UE 1 and the source eNB 2 via AS Security Mode Command (SMC) procedure, and the token would be used between the UE 1 and the target eNB 3 .
  • the solution described in 3GPP contribution S3-161717 is trying to solve the problem of how to show to the eNB that a genuine UE 1 wants to re-establish an RRC connection. The problem of how to show to the UE 1 that it is connected to a genuine eNB is not contemplated.
  • the authentication token can be generated and sent by the MME, the source eNB or the target eNB.
  • the DL authentication token may be calculated using the NAS or AS keys (although the latter is not within the scope of the claims of this application) depending on which entity that is sending it. The following cases are identified:
  • a DL authentication token is always sent to the UE via the target eNB.
  • DL authentication token is sent from the source eNB via the target eNB to the UE and is checked by the UE with an AS key.
  • the target eNB calculates the token with KrrC_int keys received from the source eNB. This variant is not within the scope of the claims of this application.
  • DL authentication token is sent from the MME via the source eNB and target eNB to UE and is checked by the UE with a NAS key.
  • DL authentication token is sent from the MME in a Path Switch Acknowledge message via the target eNB to the UE and the UE checks the DL authentication token with a NAS key.
  • DL authentication token is sent from the MME in a new message via the target eNB to the UE and the UE checks the token with a NAS key.
  • RLF radio link failure
  • DoNAS CP CIoT
  • the network's authentication token for use in CP CIoT (denoted MAC CIoT DL) is a token that will be used for authentication of the network, i.e. to show to the UE 1 that it is connected to a genuine target eNB 3 .
  • the MAC CIoT DL may according to aspects of the claimed invention be calculated with the following as the input:
  • the input used for the calculation of the MAC CIoT DL will be denoted Input-MAC CIoT DL.
  • the target cell's identity may thus be part of the Input-MAC CIoT DL, but the NAS integrity key may be separate from the Input-MAC-CIoT DL received by the UE, since it typically already has the NAS integrity key and used it for calculation of the MAC CIoT UL.
  • the function used for the calculation of the MAC CIoT DL may be the same used in Annex B.2 of TS 33.401 for RRC re-establishment and RRC resume, i.e. an integrity algorithm in the form of a NAS 128-bit integrity algorithm, which may be 128-EIA1, 128-EIA2 and 128-EIA3.
  • Variant 1a is illustrated in FIGS. 3 a and 3 b , wherein MAC CIoT DL is sent from the source eNB and is checked by the UE with an AS key (not within the scope of the claims of the application) or a NAS key.
  • This variant is based on a negotiation of AS algorithm via the NAS protocol and subsequent checking of the uplink token called MAC CIoT UL in the source eNB.
  • the variant comprises a mechanism where the source eNB, after having checked MAC CIoT UL, generates a downlink token called MAC CIoT DL.
  • the source eNB sends the MAC CIoT DL to the target eNB in an X2 UE context response message.
  • the target eNB sends the MAC CIoT DL further to the UE in an RRC message for authentication checking. If the check of the MAC CIoT DL is successful, the UE knows that it is connected to an authentic eNB, and not to a fake eNB.
  • Steps 1 to 15 are as defined in current 3GPP specifications.
  • the UE sets up an RRC connection and sends data over NAS, which is forwarded from MME to Serving-Gateway (S-GW)/Packet Data Network-Gateway (P-GW).
  • S-GW Serving-Gateway
  • P-GW Packet Data Network-Gateway
  • An RLF happens in step 15 .
  • the RLF can also happen before the UE has received DL data.
  • Step 16 The UE initiates an RRC connection by sending a Random Access message to a target eNB.
  • Step 17 The target eNB responses with Random Access Response to the UE.
  • Step 18 The UE generates an authentication token, MAC CIoT UL.
  • the token could instead be derived by an AS key instead of the NAS key.
  • the AS key may be an AS integrity key, such as K RRCint .
  • Step 19 The UE sends an RRC connection reestablishment message to the target eNB, e.g. for CP IoT EPS (Evolved Packet System) optimization.
  • the message includes the MAC CIoT UL.
  • Step 20 The target eNB sends an X2 UE context request message to the source eNB.
  • the message includes the MAC CIoT UL.
  • Step 21 The source eNB checks if the MAC CIoT UL is authentic.
  • Step 22 If the authentication is successful, the source eNB generates MAC CIoT DL as described above using Input-MAC CIoT DL and the Key-MAC CIoT DL and processing continues in step 23 . If the authentication fails, the source eNB sends an X2 UE context response indicating failure. The failure will trigger the target eNB to release the RRC connection (not illustrated).
  • Step 23 The source eNB sends an X2 UE context response to the target eNB.
  • the message includes the MAC CIoT DL.
  • the message may further include Input-MAC CIoT DL.
  • Step 24 The target eNB sends an RRC connection reestablishment message to the UE.
  • the message includes the MAC CIoT DL.
  • the message may further include Input-MAC CIoT DL.
  • Step 25 Upon receiving the RRC connection reestablishment message the UE authenticates the MAC CIoT DL using Input-MAC CIoT DL and the Key-MAC CIoT DL as described above.
  • Step 26 A If the MAC CIoT DL authentication is successful.
  • the UE may perform actions such as not sending further messages or transitioning to RRC_CONNECTED mode to authenticate the network, etc.
  • Variant 1b is illustrated in FIGS. 4 a -4 b , wherein MAC CIoT DL is sent from the MME to the source eNB and from source eNB to target eNB and from target eNB to the UE and then checked by the UE with a NAS key.
  • Steps 1 to 18 are as defined in current 3GPP specifications.
  • Step 19 The UE sends an RRC message to the target eNB including the MAC CIoT UL.
  • the RRC message may be an RRC connection reestablishment request, an RRC resume request, or some other RRC message.
  • Step 20 The target eNB sends an X2 message to the source eNB including the MAC CIoT UL.
  • the X2 message may be an X2 context fetch message.
  • Step 21 The source eNB sends an S1 message to the MME including the MAC CIoT UL and Input-MAC CIoT UL.
  • Step 22 Upon receiving the MAC CIoT UL and Input-MAC CIoT UL, the MME verifies the MAC CIoT UL by performing the same calculation that the UE performed and comparing it with the received MAC CIoT UL. If the verification is successful, the MME generates MAC CIoT DL as described above using Input-MAC CIoT DL and the Key-MAC CIoT DL and processing continues in step 23 , wherein the MME sends an St message indicating success to the source eNB and includes MAC CIoT DL. If the verification is not successful, the MME sends an St message indicating error to the source eNB. The source eNB then sends an X2 UE context response indicating failure. The failure will trigger the target eNB to release the RRC connection (not illustrated).
  • Step 23 The MME sends an S1 Check response message to the source eNB indicating success.
  • the message includes the MAC CIoT DL.
  • the message may further include Input-MAC CIoT DL.
  • Step 24 The source eNB sends an UE context response to the target eNB.
  • the message includes the MAC CIoT DL.
  • the message may further include Input-MAC CIoT DL.
  • Step 25 The target eNB sends an RRC connection reestablishment message to the UE.
  • the message includes the MAC CIoT DL.
  • the message may further include Input-MAC CIoT DL.
  • Step 26 Upon receiving the RRC connection reestablishment message the UE authenticates the MAC CIoT DL using Input-MAC CIoT DL and the Key-MAC CIoT DL as described above.
  • Step 27 A If the MAC CIoT DL authentication is successful
  • the UE may perform actions such as not sending further messages or transitioning to RRC_CONNECTED mode to authenticate the network, etc.
  • Variant 2a is illustrated in FIG. 5 , wherein the MAC CIoT DL is sent from the MME to the target eNB in an S1AP Path Switch Request Acknowledgment message.
  • the MAC CIoT DL is sent from the target eNB to the UE.
  • Path Switch Request Acknowledgement This variant is based on an existing S1AP message called Path Switch Request Acknowledgement which is sent from the MME to the target eNB.
  • the Path Switch Request Acknowledgement is modified to be able to carry the MAC CIoT DL and Input-MAC CIoT DL. It should be obvious to the person skilled in the art that the order of the steps, messages, and fields could be altered; messages combined; fields put in different messages, etc; to achieve the same effect.
  • Steps 1 - 17 are the same as described above in connection with FIG. 3 a.
  • Steps 18 - 19 are also the same as describe above in connection with FIG. 3 a , but these are also shown in FIG. 5 for the completeness of the RRC Connection Reestablishment procedure.
  • Step 20 The target eNB requests the source eNB to send the UE's context.
  • An existing X2 message called Retrieve UE Context Request may be adapted as necessary (e.g., using ReestabUE-Identity instead of ResumeIdentity).
  • Step 21 The source eNB sends the UE's context to the target eNB.
  • An existing X2 message called Retrieve UE Context Response may be adapted as necessary.
  • Step 22 The target eNB sends an RRC Connection Reestablishment message to the UE.
  • Step 23 The UE sends an RRC Connection Reestablishment Complete message, optionally containing NAS Data PDU (Protocol Data Unit) to the target eNB.
  • RRC Connection Reestablishment Complete message optionally containing NAS Data PDU (Protocol Data Unit)
  • the target eNB sends a Path Switch Request to the MME.
  • the target eNB includes MAC CIoT UL and Input-MAC CIoT UL.
  • the Input-MAC CIoT UL may include the target cell's identity.
  • the target eNB received the MAC CIoT UL in Step 19 .
  • the Input-MAC CIoT UL may include information that the target eNB received in step 19 and/or step 21 , and/or the target eNB's own information.
  • the Path Switch Request may contain the UE's information that enables the MME to identify the UE's context in the MME. That UE's information is today called “Source MME UE S1AP ID” which the target eNB is able to provide from the information it received in step 23 .
  • Step 25 The MME authenticates the MAC CIoT UL, e.g. by using the Input-MAC CIoT UL and the Key-MAC CIoT UL as input to the Fun-MAC CIoT UL.
  • the Key-MAC CIoT UL is in an embodiment the same as the Key-MAC CIoT DL, i.e. the NAS integrity key which may be derived separately by the MME and the UE respectively based on KASME, as is known to the person skilled in the art.
  • Step 26 The MME generates MAC CIoT DL as described above using Input-MAC CIoT DL and the Key-MAC CIoT DL. Some elements of the Input-MAC CIoT DL, like the target cell's identity (cell-ID), may be obtained from the Input-MAC CIoT UL.
  • Step 27 The MME sends an S1 message, Path Switch Request Acknowledge message, indicating success to the target eNB and the Path Switch Request Acknowledge message is adapted to include MAC CIoT DL and Input-MAC CIoT DL.
  • Step 28 The target eNB now knows that the MAC CIoT UL sent by the UE and mentioned in earlier steps is authentic.
  • the target eNB sends the MAC CIoT DL and Input-MAC CIoT DL to the UE in an RRC message, for example by putting them in the DedicatedInfoNAS field of the DLInformationTransfer message of the RRC DL Information Transfer procedure.
  • a new kind of RRC procedure may also be introduced for this particular purpose of conveying the MAC CIoT DL to the UE, e.g. RRC Reestablishment Confirm.
  • Step 29 The UE authenticates the MAC CIoT DL using the Input-MAC CIoT DL and the Key-MAC CIoT DL as input to the Fun-MAC CIoT DL.
  • the UE may perform actions such as not sending further messages or transitioning to RRC_CONNECTED mode to authenticate the network, etc.
  • Variant 2b is illustrated in FIG. 6 , wherein the MAC CIoT DL is sent from the MME to the target eNB in a new S1AP message and from the target eNB to the UE.
  • This variant is based on a new S1AP message (denoted Check MAC Request) which is sent from the target eNB to the MME.
  • the Check MAC Request message is able to carry the MAC CIoT UL and Input-MAC CIoT UL.
  • new S1AP messages denoted Check MAC Acknowledge and Check MAC Failure, which are sent from the MME to the target eNB are used to respectively indicate that the MAC CIoT UL was authentic or not-authentic.
  • the new S1AP message Check MAC Acknowledge carries the MAC CIoT DL and Input-MAC CIoT DL from the MME to the target eNB.
  • the target eNB includes the MAC CIoT DL and Input-MAC CIoT DL to the UE in an RRC Connection Reestablishment message. It should be obvious to a person skilled in the art to notice that the order of the steps, messages, fields could be altered; messages combined; fields put in different messages, etc. to achieve the same effect.
  • Steps 1 - 17 are same as discussed above in connection with FIG. 3 .
  • Steps 18 - 19 are also same as discussed above, but are illustrated for the completeness of the RRC Connection Reestablishment procedure.
  • Step 20 The target eNB requests the source eNB to send the UE's context.
  • An existing X2 message called Retrieve UE Context Request may be adapted as necessary e.g., using ReestabUE-Identity instead of ResumeIdentity.
  • Step 21 The source eNB sends the UE's context to the target eNB.
  • An existing X2 message called Retrieve UE Context Response may be adapted as necessary.
  • the UE's context tells the target eNB the corresponding MME that the UE is registered at.
  • Step 22 The target eNB sends a message in the form of a Check MAC Request to the MME identified in step 21 .
  • the target eNB includes MAC CIoT UL and Input-MAC CIoT UL.
  • the target eNB received the MAC CIoT UL in step 19 .
  • the Input-MAC CIoT UL may include information that the target eNB received in step 19 and/or step 21 , and/or the target eNB's own information Such information included in the Input-MAC CIoT UL may be the target cell's identity, which thus has been used as input together with at least the NAS integrity key to generate the UL authentication token MAC CIoT UL.
  • the Check MAC Request may also contain UE's information that enables the MME to identify the UE's context in the MME.
  • That UE's information may for example be the MME UE S1AP ID that the target eNB received from the source eNB in step 21 .
  • Step 23 The MME authenticates the MAC CIoT UL using the Input-MAC CIoT UL and the Key-MAC CIoT UL (e.g. the same NAS integrity key used as Key-MAC CIoT DL) as input to the Fun-MAC CIoT UL.
  • the result of the Fun-MAC CIoT UL is compared with the received MAC CIoT UL for a verification of the received MAC CIoT UL.
  • Step 24 The MME generates MAC CIoT DL as described above using the Input-MAC CIoT DL and the Key-MAC CIoT DL. Some elements of the Input-MAC CIoT DL, like the target cell's identity, may be obtained from the Input-MAC CIoT UL.
  • the MME sends an St message (Check MAC Acknowledge message) indicating success to the target eNB and includes MAC CIoT DL and Input-MAC CIoT DL.
  • Step 25 The MME sends a Check MAC Request Acknowledge message to the target eNB.
  • the message includes the MAC CIoT DL, and optionally also Input-MAC CIoT DL.
  • the target eNB now knows that the MAC CIoT UL mentioned in earlier steps is authentic.
  • Step 26 The target eNB sends an RRC Connection Reestablishment message to the UE.
  • This message includes the MAC CIoT DL and may include Input-MAC CIoT DL.
  • Step 27 The UE authenticates the MAC CIoT DL using the Input-MAC CIoT DL and the Key-MAC CIoT DL as input to the Fun-MAC CIoT DL.
  • Step 28 If the authentication of MAC CIoT DL in step 27 is successful then the UE sends an RRC Connection Reestablishment Complete message, optionally containing NAS Data PDU to the target eNB.
  • the UE may perform some actions such as not sending further messages or transitioning to RRC_CONNECTED mode to authenticate the network, etc.
  • a method, according to an embodiment, for re-establishing an RRC connection between a UE and a target eNB is presented with reference to FIG. 7A .
  • the method is performed by the UE 1 and comprises receiving S 100 an RRC Connection Reestablishment message from a target eNB 3 , e.g. for CP IoT optimization, the RRC Connection Reestablishment message including a DL authentication token which has been generated by the MME 4 and has had a NAS integrity key as input, and authenticating S 110 the received DL authentication token.
  • the RRC Connection Reestablishment message including the DL authentication token may optionally also include an Input-MAC CIoT DL, and the received DL authentication token may be authenticated by using the received Input-MAC CIoT DL and the NAS integrity key.
  • the RRC message may be an RRC DL Information Transfer message including MAC CIoT DL and optionally Input-MAC CIoT DL, and the received MAC CIoT DL may be authenticated by using Input-MAC CIoT DL and key-MAC CIoT DL.
  • the UE calculates a UL authentication token (referred to as UL AT in FIG. 7A ) with the NAS integrity key as input, and in an optional step S 90 sends an RRC connection reestablishment request including the UL authentication token to the target eNB 3 .
  • the UL authentication token may be calculated with the target cell's identity as input and the target cell's identity may be included in the RRC connection reestablishment request, e.g. as a part of an Input-MAC UL.
  • a method, according to an embodiment, for re-establishing a RRC connection between a UE and a target eNB, e.g. for CP IoT optimization, is presented with reference to FIG. 7B .
  • the method is performed by the target eNB 3 and comprises receiving S 300 , from the MME 4 , a message including a DL authentication token that has been generated by the MME, wherein the DL authentication token has been generated with a Non Access Stratum integrity key as input, and sending S 310 an RRC Connection Reestablishment message to the UE 1 , the RRC Connection Reestablishment message including the DL authentication token.
  • the target eNB receives from the UE 1 an RRC connection reestablishment request which includes a UL authentication token, wherein the UL authentication token has been calculated by the UE 1 with the NAS integrity key as input.
  • the UL authentication token in one embodiment together with the Input-MAC CIoT UL including the target cell's identity.
  • the target eNB sends/forwards the UL authentication token to the MME 4 , optionally with the Input-MAC CIoT UL including the target cell's identity.
  • the sent RRC Connection Reestablishment message may include an Input-MAC CIoT DL.
  • the received message may be a Patch Switch Request Acknowledge message including Input-MAC CIoT DL.
  • the received message may be a Check MAC Acknowledge message including and Input-MAC CIoT DL.
  • a method, according to an embodiment, for re-establishing a RRC connection between a UE and a target eNB, e.g. for CP IoT optimization, is presented with reference to FIG. 7C .
  • the method is performed in a source eNB 2 and comprises obtaining S 200 a DL authentication token that has been generated with a NAS integrity key as input, and sending S 210 a response message to a target eNB 3 , the response message including the obtained DL authentication token.
  • the obtaining S 200 may comprise generating the DL authentication token, or receiving an S1 Check response message from an MME 4 , the received S1 Check response including the DL authentication token and optionally also Input-MAC CIoT DL.
  • the response message may be an X2 UE Context response message.
  • a method, according to an embodiment, for re-establishing a RRC connection between a UE and a target eNB, e.g. for CP IoT optimization, is presented with reference to FIG. 7D .
  • the method is performed by the MME 4 and comprises generating S 400 a DL authentication token with a NAS integrity key as input, and sending S 410 a message including the generated DL authentication token to the target eNB 3 .
  • the DL authentication token may be generated with also the target cell's identity as input.
  • the MME receives an UL authentication token from the target eNB 3 , said UL authentication token having been generated by the UE 1 with the NAS integrity key as input, and in an optional step S 390 verifies the UL authentication token, e.g. by calculating a second UL authentication token in the same way as the UE did (e.g. with the NAS integrity key and the target cell's identity as input) and then comparing the second UL authentication token with the one received from the target eNB.
  • the message may be a Path Switch Request Acknowledge message and includes Input-MAC CIoT DL.
  • the message may be a Check MAC Acknowledge message including Input-MAC CIoT DL.
  • a UE 1 for re-establishing a RRC connection between the UE 1 and the target eNB 3 , is presented with reference to FIG. 8 .
  • the UE 1 comprises a processor 10 and a computer program product.
  • the computer program product stores instructions that, when executed by the processor, causes the UE to receive an RRC Connection Reestablishment message from a target eNB 3 , the RRC Connection Reestablishment message including a DL authentication token which has been generated by the MME 4 and has had a NAS integrity key as input, and authenticate the received DL authentication token.
  • the RRC Connection Reestablishment message may optionally include Input-MAC CIoT DL, and the received DL authentication token may be authenticated by using Input-MAC CIoT DL and the NAS integrity key.
  • a source eNB for re-establishing a RRC connection between a UE 1 and a target eNB 3 , is presented with reference to FIG. 9 .
  • the source eNB 2 comprises a processor 20 and a computer program product.
  • the computer program product stores instructions that, when executed by the processor, causes the source eNB to obtain a DL authentication token that has been generated with a NAS integrity key as input, and send a response message to the target eNB 3 , the response message including the obtained DL authentication token.
  • the response message may be an X2 UE Context response message.
  • a target eNB for re-establishing a RRC connection between a UE 1 and a target eNB 3 , is presented with reference to FIG. 10 .
  • the target eNB 3 comprises a processor 30 and a computer program product.
  • the computer program produce stores instructions that, when executed by the processor, causes the target eNB to receive from the MME 4 a message including a DL authentication token that has been generated by the MME 4 , wherein the DL authentication token has been generated with a NAS integrity key as input; and send an RRC Connection Reestablishment message to a UE 1 , the RRC Connection Reestablishment message including the DL authentication token.
  • the DL authentication token has in one embodiment been calculated by the MME 4 with a target cell's identity as input.
  • the sent RRC Connection Reestablishment message is optionally including Input-MAC CIoT DL, which may include the target cell's identity.
  • the received message may be a Patch Switch Request Acknowledge message including the Input-MAC CIoT DL.
  • the received message may be a Check MAC Acknowledge message including Input-MAC CIoT DL.
  • a MME for re-establishing a RRC connection between a UE 1 and a target eNB 3 , is presented with reference to FIG. 11 .
  • the MME 4 comprises a processor 40 and a computer program product.
  • the computer program product stores instructions that, when executed by the processor, causes the MME to generate a DL authentication token with a NAS integrity key as input, and to send a message including the generated DL authentication token to the target eNB 3 .
  • the message may be a Path Switch Request Acknowledge message, the message including an Input-MAC CIoT DL.
  • the message may be a Check MAC Acknowledge message, the message including the Input-MAC CIoT DL.
  • FIG. 8 is a schematic diagram showing some components of the UE 1 .
  • the processor to may be provided using any combination of one or more of a suitable central processing unit, CPU, multiprocessor, microcontroller, digital signal processor, DSP, application specific integrated circuit etc., capable of executing software instructions of a computer program 14 stored in a memory.
  • the memory can thus be considered to be or form part of the computer program product 12 .
  • the processor to may be configured to execute methods described herein with reference to FIG. 7A .
  • the memory may be any combination of read and write memory, RAM, and read only memory, ROM.
  • the memory may also comprise persistent storage, which, for example, can be any single one or combination of magnetic memory, optical memory, solid state memory or even remotely mounted memory.
  • a second computer program product 13 in the form of a data memory may also be provided, e.g. for reading and/or storing data during execution of software instructions in the processor 10 .
  • the data memory can be any combination of read and write memory, RAM, and read only memory, ROM, and may also comprise persistent storage, which, for example, can be any single one or combination of magnetic memory, optical memory, solid state memory or even remotely mounted memory.
  • the data memory may e.g. hold other software instructions 15 , to improve functionality for the UE 1 .
  • the UE 1 may further comprise an input/output (I/O) interface ii including e.g. a user interface.
  • the UE 1 may further comprise a receiver configured to receive signalling from other nodes, and a transmitter configured to transmit signalling to other nodes (not illustrated).
  • Other components of the UE 1 are omitted in order not to obscure the concepts presented herein.
  • FIG. 12 is a schematic diagram showing functional blocks of the UE 1 .
  • the modules may be implemented as only software instructions such as a computer program executing in the cache server or only hardware, such as application specific integrated circuits, field programmable gate arrays, discrete logical components, transceivers, etc. or as a combination thereof. In an alternative embodiment, some of the functional blocks may be implemented by software and other by hardware.
  • the modules correspond to the steps in the methods illustrated in FIG. 7A , comprising a determination manager unit 60 and a communication manager unit 61 .
  • modules are implemented by a computer program, it shall be understood that these modules do not necessarily correspond to process modules, but can be written as instructions according to a programming language in which they would be implemented, since some programming languages do not typically contain process modules.
  • the determination manger 60 is for enabling re-establishing a RRC connection between a UE and a target eNB.
  • This module corresponds to the check step S 110 of FIG. 7A , i.e. the authentication of the received DL authentication token.
  • This module can e.g. be implemented by the processor 10 of FIG. 8 , when running the computer program.
  • the communication manger 61 is for enabling re-establishing a RRC connection between a UE and a target eNB.
  • This module corresponds to the receive step S 100 of FIG. 7A .
  • This module can e.g. be implemented by the processor 10 of FIG. 12 , when running the computer program.
  • FIG. 9 is a schematic diagram showing some components of the source eNB 2 .
  • the processor 20 may be provided using any combination of one or more of a suitable central processing unit, CPU, multiprocessor, microcontroller, digital signal processor, DSP, application specific integrated circuit etc., capable of executing software instructions of a computer program 24 stored in a memory.
  • the memory can thus be considered to be or form part of the computer program product 22 .
  • the processor 20 may be configured to execute methods described herein with reference to FIG. 7B .
  • the memory may be any combination of read and write memory, RAM, and read only memory, ROM.
  • the memory may also comprise persistent storage, which, for example, can be any single one or combination of magnetic memory, optical memory, solid state memory or even remotely mounted memory.
  • a second computer program product 23 in the form of a data memory may also be provided, e.g. for reading and/or storing data during execution of software instructions in the processor 20 .
  • the data memory can be any combination of read and write memory, RAM, and read only memory, ROM, and may also comprise persistent storage, which, for example, can be any single one or combination of magnetic memory, optical memory, solid state memory or even remotely mounted memory.
  • the data memory may e.g. hold other software instructions 25 , to improve functionality for the source eNB 2 .
  • the source eNB 2 may further comprise an input/output (I/O) interface 21 including e.g. a user interface.
  • the source eNB 2 may further comprise a receiver configured to receive signalling from other nodes, and a transmitter configured to transmit signalling to other nodes (not illustrated).
  • Other components of the source eNB 2 are omitted in order not to obscure the concepts presented herein.
  • FIG. 13 is a schematic diagram showing functional blocks of the source eNB 2 .
  • the modules may be implemented as only software instructions such as a computer program executing in the cache server or only hardware, such as application specific integrated circuits, field programmable gate arrays, discrete logical components, transceivers, etc. or as a combination thereof. In an alternative embodiment, some of the functional blocks may be implemented by software and other by hardware.
  • the modules correspond to the steps in the methods illustrated in FIG. 7C , comprising a determination manager unit 70 and a communication manager unit 71 .
  • modules are implemented by a computer program, it shall be understood that these modules do not necessarily correspond to process modules, but can be written as instructions according to a programming language in which they would be implemented, since some programming languages do not typically contain process modules.
  • the determination manger 70 is for enabling re-establishing a RRC connection between a UE and a target eNB.
  • This module corresponds to the obtain step S 200 of FIG. 7C .
  • This module can e.g. be implemented by the processor 20 of FIG. 9 , when running the computer program.
  • the communication manger 71 is for enabling re-establishing a RRC connection between a UE and a target eNB.
  • This module corresponds to the send step S 210 of FIG. 7C .
  • This module can e.g. be implemented by the processor 20 of FIG. 13 , when running the computer program.
  • FIG. 10 is a schematic diagram showing some components of the target eNB 3 .
  • the processor 30 may be provided using any combination of one or more of a suitable central processing unit, CPU, multiprocessor, microcontroller, digital signal processor, DSP, application specific integrated circuit etc., capable of executing software instructions of a computer program 34 stored in a memory.
  • the memory can thus be considered to be or form part of the computer program product 32 .
  • the processor 30 may be configured to execute methods described herein with reference to FIG. 7C .
  • the memory may be any combination of read and write memory, RAM, and read only memory, ROM.
  • the memory may also comprise persistent storage, which, for example, can be any single one or combination of magnetic memory, optical memory, solid state memory or even remotely mounted memory.
  • a second computer program product 33 in the form of a data memory may also be provided, e.g. for reading and/or storing data during execution of software instructions in the processor 30 .
  • the data memory can be any combination of read and write memory, RAM, and read only memory, ROM, and may also comprise persistent storage, which, for example, can be any single one or combination of magnetic memory, optical memory, solid state memory or even remotely mounted memory.
  • the data memory may e.g. hold other software instructions 35 , to improve functionality for the target eNB 3 .
  • the target eNB 3 may further comprise an input/output (I/O) interface 31 including e.g. a user interface.
  • the target eNB 3 may further comprise a receiver configured to receive signalling from other nodes, and a transmitter configured to transmit signalling to other nodes (not illustrated).
  • Other components of the target eNB 3 are omitted in order not to obscure the concepts presented herein.
  • FIG. 14 is a schematic diagram showing functional blocks of the target eNB 3 .
  • the modules may be implemented as only software instructions such as a computer program executing in the cache server or only hardware, such as application specific integrated circuits, field programmable gate arrays, discrete logical components, transceivers, etc. or as a combination thereof. In an alternative embodiment, some of the functional blocks may be implemented by software and other by hardware.
  • the modules correspond to the steps in the methods illustrated in FIG. 7B , comprising a determination manager unit 80 and a communication manager unit 81 .
  • modules are implemented by a computer program, it shall be understood that these modules do not necessarily correspond to process modules, but can be written as instructions according to a programming language in which they would be implemented, since some programming languages do not typically contain process modules.
  • the communication manger 81 is for enabling re-establishing a RRC connection between a UE and a target eNB.
  • This module corresponds to the receive step S 300 and the send step 310 of FIG. 7B .
  • This module can e.g. be implemented by the processor 30 of FIG. 10 , when running the computer program.
  • FIG. 11 is a schematic diagram showing some components of the MME 4 .
  • the processor 40 may be provided using any combination of one or more of a suitable central processing unit, CPU, multiprocessor, microcontroller, digital signal processor, DSP, application specific integrated circuit etc., capable of executing software instructions of a computer program 44 stored in a memory.
  • the memory can thus be considered to be or form part of the computer program product 42 .
  • the processor 40 may be configured to execute methods described herein with reference to FIG. 7D .
  • the memory may be any combination of read and write memory, RAM, and read only memory, ROM.
  • the memory may also comprise persistent storage, which, for example, can be any single one or combination of magnetic memory, optical memory, solid state memory or even remotely mounted memory.
  • a second computer program product 43 in the form of a data memory may also be provided, e.g. for reading and/or storing data during execution of software instructions in the processor 40 .
  • the data memory can be any combination of read and write memory, RAM, and read only memory, ROM, and may also comprise persistent storage, which, for example, can be any single one or combination of magnetic memory, optical memory, solid state memory or even remotely mounted memory.
  • the data memory may e.g. hold other software instructions 45 , to improve functionality for the MME 4 .
  • the MME 4 may further comprise an input/output (I/O) interface 41 including e.g. a user interface.
  • the MME 4 may further comprise a receiver configured to receive signalling from other nodes, and a transmitter configured to transmit signalling to other nodes (not illustrated).
  • Other components of the MME 4 are omitted in order not to obscure the concepts presented herein.
  • FIG. 15 is a schematic diagram showing functional blocks of the MME 4 .
  • the modules may be implemented as only software instructions such as a computer program executing in the cache server or only hardware, such as application specific integrated circuits, field programmable gate arrays, discrete logical components, transceivers, etc. or as a combination thereof. In an alternative embodiment, some of the functional blocks may be implemented by software and other by hardware.
  • the modules correspond to the steps in the methods illustrated in FIG. 7D , comprising a determination manager unit 90 and a communication manager unit 91 .
  • modules are implemented by a computer program, it shall be understood that these modules do not necessarily correspond to process modules, but can be written as instructions according to a programming language in which they would be implemented, since some programming languages do not typically contain process modules.
  • the determination manger 90 is for enabling re-establishing a RRC connection between a UE and a target eNB.
  • This module corresponds to the generate step 400 of FIG. 7D .
  • This module can e.g. be implemented by the processor 40 of FIG. 11 , when running the computer program.
  • the communication manger 91 is for enabling re-establishing a RRC connection between a UE and a target eNB.
  • This module corresponds to the send step S 410 of FIG. 7D .
  • This module can e.g. be implemented by the processor 40 of FIG. 11 , when running the computer program.

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